As Millian Wolff has noted (thus releasing Massif Visualizer 0.1), I finaly was able to correct the building of most of the KGraphViewer packages on the OpenSuse Build Service, thus officialy releasing KGraphViewer 2.1. Well, I'll have to release soon a 2.1.1 because some include files were not installed, preventing to use the DotGraphView widget independently using the library. But before I'd like also to change this class to use a d-pointer, avoiding to install unwanted includes and being a cleaner library.
Also, I have asked to move kgraphviewer code to git. Thanks to the efficiency of KDE admins, this have been done very quickly and you can now access to the KGraphViewer projects.kde.org page to find the repository.